Liquid pressure control device for load responding brake

Abstract

A liquid pressure control device (1) including a valve mechanism for reducing liquid pressure of a brake master cylinder at a predetermined ratio by a pair of plungers (3, 4) moved independently by liquid pressure from the brake master cylinder through ports (7, 8) and for transmitting the reduced pressure to brake cylinders, of right and left rear wheels through ports (9, 10), respectively, and a load sensing mechanism (11) for having a load according to a movable load of a vehicle act on respective plungers (3, 4) so as to move a pressure reduction starting point of the valve mechanism. The load sensing mechanism (11) has a spring (12) connected to an axle side at one end thereof for transmitting energizing force according to the movable load of the vehicle, a load sensing lever (13) pivotally supported on a housing of the valve mechanisms (5, 6) at one end thereof and connected to the other end of the spring at the other end thereof, an equalizer (14) abutting against ends (3a, 4a ) of respective plungers (3, 4), and a clamp member (15) for attaching the equalizer fixedly at a predetermined position of the load sensing lever and preventing the equalizer from coming off due to a large movement of the load sensing lever.

I claim: 
     
       1. A liquid pressure control device for a load responding brake of a vehicle, including a valve mechanism mounted in a housing for reducing liquid pressure of a brake master cylinder at a predetermined ratio by means of a pair of plungers moved independently by liquid pressure from the brake master cylinder and for transmitting the reduced pressure to brake cylinders of right and left rear wheels, respectively, and a load sensing mechanism acting on said respective plungers for moving a pressure reduction starting point of said valve mechanism in response to a movable load of the vehicle, said load sensing mechanism comprising: a load sensing lever having a first end pivotally connected to said housing of said valve mechanism and a second end;   a spring having one end thereof connected to an axle side and the other end thereof connected to said second end of said lever for transmitting energizing force according to said movable load of the vehicle;   an equalizer abutting against one end of each of said plungers and having first and second end portions; and   a clamp member having a positioning means for said lever and hook-shaped portions engaging said end portions of said equalizer for securing said equalizer at a predetermined position on said load sensing lever.   
     
     
       2. The liquid pressure control device as claimed in claim 1, and further comprising: abutting positions on said equalizer for engaging said one end of each plunger, respectively; and   guides on said equalizer for guiding said one end of each plunger into said abutting positions.   
     
     
       3. The liquid pressure control device as claimed in claim 2, wherein: said positioning means for said load sensing lever comprises a hole through said clamp member for receiving said lever therein.   
     
     
       4. The liquid pressure control device as claimed in claim 3 wherein: said equalizer extends in a first direction with respect to said clamp member; and   said hole for positioning said lever extends in a second direction substantially transversely to said first direction.   
     
     
       5. The liquid pressure control device as claimed in claim 4 wherein: said equalizer has a substantially U-shaped cross section; and   each of said hook-shaped portions of said clamp member has a part thereof extending into one of said end portions of said equalizer between the legs of said U-shaped cross section.   
     
     
       6. The liquid pressure control device as claimed in claim 5 and further comprising: first and second opposite sides on said clamp member, said hook-shaped portions extending from said first side; and   recess means in said second side of said clamp member for receiving said equalizer.   
     
     
       7. The liquid pressure control device as claimed in claim 6 and further comprising: recess means in said equalizer for receiving part of said load sensing lever therein.   
     
     
       8. The liquid pressure control device as claimed in claim 7 and further comprising: interengaging cooperating means on said clamp member and said load sensing lever for positioning said load sensing lever in said hole relative to said clamp member.   
     
     
       9. The liquid pressure control device as claimed in claim 8 wherein: said cooperating means comprises a recess in one of said clamp member and lever and a projection in the other of said clamp member and lever.   
     
     
       10. The liquid pressure control device as claimed in claim 1, wherein: said positioning means for said load sensing lever comprises a hole through said clamp member for receiving said lever therein.   
     
     
       11. The liquid pressure control device as claimed in claim 10 wherein: said equalizer extends in a first direction with respect to said clamp member; and   said hole for positioning said lever extends in a second direction substantially transversely to said first direction.   
     
     
       12. The liquid pressure control device as claimed in claim 10 and further comprising: interengaging cooperating means on said clamp member and said load sensing lever for positioning said load sensing lever in said hole relative to said clamp member.   
     
     
       13. The liquid pressure control device as claimed in claim 12 wherein: said cooperating means comprises a recess in one of said clamp member and lever and a projection in the other of said clamp member and lever.   
     
     
       14. The liquid pressure control device as claimed in claim 1 wherein: said equalizer has a substantially U-shaped cross section; and   each of said hook-shaped portions of said clamp member has a part thereof extending into one of said end portions of said equalizer between the legs of said U-shaped cross section.   
     
     
       15. The liquid pressure control device as claimed in claim 1 and further comprising: first and second opposite sides on said clamp member, said hook-shaped portions extending from said first side; and   recess means in said second side of said clamp member for receiving said equalizer.   
     
     
       16. The liquid pressure control device as claimed in claim 1 and further comprising: recess means in said equalizer for receiving part of said load sensing lever therein.